feat: flag mileage target coverage gaps

src/modules/mileage/StatisticsView.tsx

@@ -6,7 +6,7 @@ import {
   Cell, LabelList,
 } from 'recharts';
 import {
-  Truck, ChevronDown, Maximize2, Minimize2,
+  AlertTriangle, Truck, ChevronDown, Maximize2, Minimize2,
   Search, ArrowUpDown, X, RotateCcw, Calendar,
 } from 'lucide-react';
 import type { TargetSummary, TargetVehicle, TargetYearlyAssessment, TrendPoint } from './types';
@@ -14,6 +14,7 @@ import { fetchTargets, fetchTargetVehicles, fetchTrend } from './api';
 import Blur from '../../components/Blur';
 import { weightedCompletionRate } from '../../shared/analytics/metrics';
 import { formatMileageSnapshotDateTime } from './data-freshness';
+import { assessVehicleCoverage } from './assessment-coverage';
 import MileageAttributionView from './MileageAttributionView';
 import {
   filterAttributionVehicles,
@@ -94,6 +95,9 @@ export default function StatisticsView() {
   const selectedTarget = targets.find(t => t.id === selectedTargetId);
   const selectedTargetVehicles = selectedTargetId === null ? [] : targetVehiclesMap[selectedTargetId] || [];
   const selectedAssessment = selectedTarget ? getTargetAssessment(selectedTarget, assessmentYearMap[selectedTarget.id]) : null;
+  const selectedCoverage = selectedTarget
+    ? assessVehicleCoverage(selectedTarget.declaredVehicleCount, selectedTarget.vehicleCount)
+    : null;
   const selectedAssessmentYear = selectedAssessment?.yearNumber;
   const selectedCompletion = selectedAssessment?.completionRate ?? selectedTarget?.avgCompletion ?? 0;
   const selectedRemaining = selectedAssessment?.remaining ?? 0;
@@ -361,6 +365,20 @@ export default function StatisticsView() {
         </motion.div>
       )}
 
+      {selectedTarget && selectedCoverage && selectedCoverage.status !== 'matched' && (
+        <div role="alert" className="flex items-start gap-2 rounded-xl border border-amber-200 bg-amber-50 px-3 py-2 text-amber-900">
+          <AlertTriangle size={15} className="mt-0.5 shrink-0 text-amber-600" />
+          <div className="min-w-0 text-[11px] font-bold leading-5">
+            <span className="font-black">考核车辆配置不一致：</span>
+            目标 {selectedCoverage.declaredCount} 台，当前有效 {selectedCoverage.activeCount} 台，
+            {selectedCoverage.status === 'missing'
+              ? `缺少 ${Math.abs(selectedCoverage.difference)} 台`
+              : `超出 ${selectedCoverage.difference} 台`}。
+            完成率、缺口和归因按当前有效车辆计算。
+          </div>
+        </div>
+      )}
+
       {selectedTarget && (
         <MileageAttributionView
           vehicles={selectedTargetVehicles}